package org.framework.interceptor;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.codehaus.jackson.map.ObjectMapper;
import org.framework.dao.plugin.Page;
import org.framework.dao.plugin.PageContext;
import org.framework.session.SessionContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.hiwan.platform.util.LangUtil;
import com.hiwan.platform.util.StackTraceUtil;

public class CommonInterceptor implements HandlerInterceptor {
	protected Logger logger = LoggerFactory.getLogger(getClass());

	public CommonInterceptor() {
	}

	// private String mappingURL;// 利用正则映射到需要拦截的路径

	// public void setMappingURL(String mappingURL) {
	// this.mappingURL = mappingURL;
	// }

	/**
	 * 在业务处理器处理请求之前被调用 如果返回false 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
	 * 
	 * 如果返回true 执行下一个拦截器,直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
	 * 从最后一个拦截器往回执行所有的postHandle() 接着再从最后一个拦截器往回执行所有的afterCompletion()
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		HttpSession session = request.getSession();
		setPageContext(request);
		setSessionContext(session);

			logger.debug("###################################################################");
			logger.debug("URI: {}", request.getRequestURI());
			try {
				ObjectMapper mapper = new ObjectMapper();
				logger.debug("request: {}",mapper.writeValueAsString(request.getParameterMap()));
			} catch (IOException e) {
				logger.error(StackTraceUtil.getStackTrace(e));
			}

			@SuppressWarnings("unchecked")
			Enumeration<String> e = session.getAttributeNames();
			while (e.hasMoreElements()) {
				String sessionAttName = e.nextElement();
				logger.debug("session : [{}: {}]", sessionAttName,
						session.getAttribute(sessionAttName));
			}
			logger.debug("pageContext : {}", PageContext.getPage());
			logger.debug("###################################################################");
		

		return true;

	}

	// 在业务处理器处理请求执行完成后,生成视图之前执行的动作
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		logger.info("==============执行顺序: 2、postHandle================");
	}

	/**
	 * 在DispatcherServlet完全处理完请求后被调用
	 * 
	 * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.info("==============执行顺序: 3、afterCompletion================");
	}

	private void setPageContext(HttpServletRequest request) {
		Integer iDisplayStart = LangUtil.parseInt(request
				.getParameter("iDisplayStart"));
		Integer iDisplayLength = LangUtil.parseInt(request
				.getParameter("iDisplayLength"));

		if (iDisplayStart != null && iDisplayLength != null) {
			Page page = PageContext.getPage();
			page.setDisplayLength(iDisplayLength);
			page.setDisplayStart(iDisplayStart);
		}
	}

	private void setSessionContext(HttpSession session) {
		SessionContext.setSession(session);
	}



	

}
